This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1007/s10832-007-9399-5 in citations.
Improved ferroelectricity of strained SrTiO3 thin films on sapphire
Improved ferroelectricity of strained SrTiO3 thin films on sapphire
Magnetron sputtered and laser deposited SrTiO3 thin films are deposited on CeO2 buffered sapphire substrates. Their structural properties are investigated and correlated to the dielectric properties of the SrTiO3 films. It is shown, that the biaxial compressive strain imposed by the substrate on the...
Saved in:
Personal Name(s): | Wördenweber, R. |
---|---|
Hollmann, E. / Ott, R. / Hürtgen, T. / Lee, T. K. | |
Contributing Institute: |
Institut für Bio- und Nanosysteme - Bioelektronik; IBN-2 JARA-FIT; JARA-FIT |
Published in: | Journal of electroceramics, 22 (2009) S. 363 - 368 |
Imprint: |
Dordrecht [u.a.]
Springer Science + Business Media B.V
2009
|
Physical Description: |
363 - 368 |
DOI: |
10.1007/s10832-007-9399-5 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Electroceramics
22 |
Subject (ZB): | |
Publikationsportal JuSER |
Magnetron sputtered and laser deposited SrTiO3 thin films are deposited on CeO2 buffered sapphire substrates. Their structural properties are investigated and correlated to the dielectric properties of the SrTiO3 films. It is shown, that the biaxial compressive strain imposed by the substrate on the ferroelectric films leads to a considerable increase of the permittivity and tunability of SrTiO3 thin films in technically relevant temperature regimes. Generally, the permittivity and tunability decreases with increasing strain. However, the ferroelectric phase transition of the SrTiO3 films is shifted to higher temperatures compared to that of single crystalline SrTiO3. As a consequence, the permittivity of the films is larger than that of undistorted SrTiO3 single crystals for small strain (Delta a/a < 0.005) and temperatures above the Curie temperature. Furthermore, a linear dependence of the loss tangent and the tunability on the permittivity is observed, which indicates, that all three properties are affected by the same mechanism that itself is affected by the lattice strain. |